149391 has 16 divisors (see below), whose sum is σ = 241920. Its totient is φ = 90360.

The previous prime is 149381. The next prime is 149393. The reversal of 149391 is 193941.

It is not a de Polignac number, because 149391 - 2¹⁰ = 148367 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (149393) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46 + ... + 548.

It is an arithmetic number, because the mean of its divisors is an integer number (15120).

2¹⁴⁹³⁹¹ is an apocalyptic number.

149391 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

149391 is a deficient number, since it is larger than the sum of its proper divisors (92529).

149391 is a wasteful number, since it uses less digits than its factorization.

149391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523 (or 517 counting only the distinct ones).

The product of its digits is 972, while the sum is 27.

The square root of 149391 is about 386.5113193685. The cubic root of 149391 is about 53.0609243623.

The spelling of 149391 in words is "one hundred forty-nine thousand, three hundred ninety-one".